Patch "drm/amd/display: Validate hw_points_num before using it" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amd/display: Validate hw_points_num before using it

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-validate-hw_points_num-before-using-.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c542fb911193763b9e35419b1756a5fe4040dcf2
Author: Alex Hung <alex.hung@xxxxxxx>
Date:   Mon Jul 10 18:23:58 2023 -0600

    drm/amd/display: Validate hw_points_num before using it
    
    [ Upstream commit 58c3b3341cea4f75dc8c003b89f8a6dd8ec55e50 ]
    
    [WHAT]
    hw_points_num is 0 before ogam LUT is programmed; however, function
    "dwb3_program_ogam_pwl" assumes hw_points_num is always greater than 0,
    i.e. substracting it by 1 as an array index.
    
    [HOW]
    Check hw_points_num is not equal to 0 before using it.
    
    Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
    Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
index 701c7d8bc038a..03a50c32fcfe1 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
@@ -243,6 +243,9 @@ static bool dwb3_program_ogam_lut(
 		return false;
 	}
 
+	if (params->hw_points_num == 0)
+		return false;
+
 	REG_SET(DWB_OGAM_CONTROL, 0, DWB_OGAM_MODE, 2);
 
 	current_mode = dwb3_get_ogam_current(dwbc30);




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